The stem cells used in Bone marrow transplantation, come from the liquid center of the bone, called the marrow. In general, the procedure for obtaining bone marrow, which is called harvesting,There are mainly three types of Bone marrow transplantation: (a) autologous, (b)syngeneic, and (c) allogeneic, bone marrow is collected from from skin over the pelvic (hip) bone or, in rare cases, the sternum (breastbone), to draw the marrow out of the bone. The harvested bone marrow is then processed to remove blood and bone fragments. Harvested bone marrow can be combined with a preservative and frozen to keep the stem cells alive until they are needed. This technique is known as cryopreservation. Stem cells can be cryopreserved for many years.
Scholarly peer review is the process of subjecting an author's scholarly work, research, or ideas to the scrutiny of others who are experts in the same field, before a paper describing this work is published in a journal. The work may be accepted, considered acceptable with revisions, or rejected. Peer review requires a community of experts in a given (narrowly defined) field, who are qualified and able to perform reasonably impartial review.